Piston-packing.



Patentad Dan. 23, 1902..

a. minmonznv. PISTON PACKING. (Application file'gi Apx 26, 1902.)

(No Modal-Y hren/or UNITED STATES PATENT Trice.

MARSHALL MONTGOMERY, OF PHILADELPHIA, PEQINSYLVANIA.

PlSTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 716,737, dated December23, 1902.

Application filed April 26, 1902. Serial No. 104,890. (No specimens.)

To ctZZ whom it may concern:

Be it known that I, MARSHALL Monroon- ERY, of the cityand county ofPhiladelphia, State of Pennsylvania, have invented an Improvement inPiston-Packing, of which the following is a specification.

My invention has reference to piston-packing; and it consists of certainimprovements,

all of which are fully set forth in the following specification andshownin the accompanying drawing, which forms a part thereof.

The object of my invention is to providea durable form of packing whichshall be selfadjusting, so as to adapt itself to various conditions ofuse and compensate for wear.

My invention will be better understood by reference to the drawing, inwhich is shown.

a perspective view of a piston-packing embodying my invention;

A and B are two strips of rubber and cloth,

triangular in cross-section and fitted together on their diagonalsurfaces toform a strand substantially rectangular in cross-section anddivided diagonally. In these parts the layers of cloth and rubber arehorizontal or transverse to the diagonal line of division H, so as topresent the series of cloth and rubber edges to the piston-rod.

To one side of the triangular part B is arranged a rectangular strip ofrubber C, preferably cemented in place at 0. Above the rubber and clothpacking parts above described I arrange the soft packing-strand D, ofcotton or other suitable textile fiber a-nd the whole is inclosed in atextile sheath, which may be plaited or otherwise formed. This holds theseveral parts in normally proper relative position. The soft packing Dholds the lubricant necessary, and the heavy wear comes upon the part A,which is next the piston-rod. The packing D also acts as a cushionbetween the successive layers-of rubber packin Toprevent rapid wear ofso that the upward thrust of the edge of the part B will not displace itor allow its edge to be torn by the moving piston-rod. The strand D andcovering E may be saturated with oils, waxes, or plumbago, orcombinations of these. The rubber 0 being on the side farthest from thepiston-rod acts as an elastic-cushion to constantly force the rubber andcloth packing A against the pistonrod, and bei'ngaway from the heat andabrading-surface ofthe piston-rod it is not injured. This rubber actsautomatically to cause the packing A to constantly fit tight to thepiston- Trod and compensate for wear and obviates the necessity offrequently compressing the packing in adirection parallel to the lengthof the piston-rod, as was heretofore necessary in piston-packings ofthis general character.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is'

1. A piston-packing consisting of a rectangular strand of rubber andcloth divided diagonally throughout its length, a longitudinal thinstrip of soft rubber arranged upon one side of the cloth and rubberstrand and of a height equal to the height of the cloth and rubberstrand, a soft textile strand arranged upon one of the faces of thecloth and rubber strand and at one end of the soft-rubber strip and of awidth equal to the combined width of the cloth and rubber strand andsoft-rubber strip, and an inclosing textile sheath binding the severalparts in relative position.

2. A piston-packing consisting of a rectangular strand of rubber andcloth divided diagonally throughout its length, and a thin longitudinalstrip of soft rubber secured to one face of the divided rectangularstrand and of a height equal to the height ofzthe rubber and clothstrand. 4 V

In testimony of which invention I have hereunto set my hand.

